This document provides information about the Goodwill Advance Stone Company limestone mine located near Chechat Village in Kota district, India. It details the mine's location, area, mineral extracted, production levels, and geological characteristics. The mine extracts Kota Stone via open pit mining methods. Overburden is removed through drilling, blasting, and excavation before the limestone is extracted. Precautions are discussed to maintain safe, stable pit walls and waste dumps. No slope or bank failures have occurred at Kota Stone mines due to near-vertical pit wall designs and competent rock types.

1. BENCH STABILITY CONSIDERATIONS
A. Hussain
Mines Manager
Stone is a fundamental requirement for human beings, as
it plays a vital role in acquiring shelter. It is quite Common that all
stone mines exist in very near proximity to the populated areas. Kota
has been quite fortunate that it has been blessed with a very large
deposit of dimensional lime stone, commonly known as "Kota Stone", in
Ramganjmandi , Chechat and other nearby areas. It is a cheap elegant
and quick fixing media for floor construction work. No floor stone is
cheaper than Kota Stone. At the same time it has developed a great
architectural trend by inter woven with white marble or other
decorative stones to give pleasing floor patterns. The stone is available
in blue, green, brown or their combinations. There is hardly any
substitute of Kota Stone floors for economical and functional buildings.
Extraction of this stone has not only fulfilled the need of
the local area, state and country but mining and allied operations have
provided (and still continuing) bread and butter to a very large no. of
families. Perhaps lime stone industry is the largest industry in the
region. This industry has also shared in the national development as
government earns large revenue under different heads. In addition Kota
Stone has also established a sizeable export market. which provides a
good foreign exchange to contribute towards our national economy.
The mines under study belong to M/s Goodwill Advance
Stone Company and is situated near Chechat Village in Kota district.

2. General information's related to the mine are as under :-
Name of Mine : M/s Goodwill Advance Stone Co.
owner : Sh. Pankaj Sethi
Sh. Rohit Seth
Location of Mine : Village - Chechat
The. - Ramganjmandi
District - Kota
Co-ordinates- 24˚ 45'50" N
75˚ 47' 46" E
Area of Mining Lease: 90,000 Sq.Met.
Mineral Worked out: Kota Stone
Mining Lease No.: 59/87
Public Road : Ramganjmando to Rawatbhata state Highway
Railway Station: Morak , 8 Km from Mines Site
Air Port: Kota , 68Km from Mines site
Working Time: Only General Shift Working
8.00 AM to 5.00 PM
Annual Production: Over Burden and Waste - 17.50 Lakh Cu.M.
(Proposed) Lime Stone - 10.- Lakh Sq.M.
GEOGLOY:
Regional : The Kota Stone deposits are located between latitudes 24˚ -
27' - 24˚ - 48' and longitudes 75˚ - 45' - 76˚ - 05'. The area is covered on
toposheets No. 45/O/113. 45/O/114, 54/D/1 and 54/D/2.
Kota Stone geologically speaking is a part of semi series of
lower VINDHYAN group. The local nomenclatures are well understood
and prevailing from the inception of the mining in this area. The
regional stratographic sequence of deposits is given as under:-
A. UPPAR VINDHYAN
1. Bhandar Series
2. Rewa Series
3. Kaimur Series
4. Semi Series

3. B. LOWER VINDHYAN
1. Suket Series
2. Nibahera Lime Stone
3. Jhalarapatan Sand Stones
The workable lime stone beds are locate at a depth of 25-28
met from surface and dip gently towards east direction at a rate of 1.0
met in every 100.0 met distance. Strike of the depth is North-South.
Lime stone bed is divided in to five sacks, separated from each other by
clay partings. A representative stratographic sequence of the deposit is
given as under:
S.No. Rock Thickness (Met)
1 Top Soil 0.00 -2.50
2 Overburden comprising 10.00-25.00
mixed calcareous rock
3 Top KotaStone sack 3.00 - 5.00
4 Middle Sack 2.50-3.00
5 Third Sack 3.00-4.00
6 Fourth Sack 1.25-2.00
Area comprises of various sedimentary formations distinctly separated
from each other by clay partings. Prominent joints planes traverse from
North-East to South-West direction. Geological structural problems e.g.
intrusion of quartz veins, fissures, crisscrosses and joints etc. have also
been observed at some place.
Exploitation activities may broadly be classified in to two
categories et.c.
* Removal of Overburden
* Extraction of Lime Stone

4. Removal of Overburden: On the top soil and sub soil exist for a
thickness of 0-2.5m. This top soil is dozed off and is transported by
dumpers, loading them using front end loaders. Thus the hard
overburden strata are exposed.
After moving the soil and subsoil, the exposed overburden
layer needs drilling and blasting. Blasted overburden is removed and
transported using front end loader- dumper/dump truck combination.
105mm diameter holes are drilled by wagon drill, for a depth of 8-9 ml.
The usual drilling pattern is 4.0m x 4.5m with proper hole staggering .
A powder factor of 10MT/Kg is achieved with following charge details in
a 9.0 M/in deep hole .
Bottom Charge : Cap sensitive primary slurry
explosives in 83mm size cartridge. 2.7 Kg.
Coloumn Charge : ANFO 20.0 Kg.
Decking : Practised
Stemming : Drill Cutting/day 2.5-3.0 Kg.
PRODUCTION FIGURES:
S.No. Year Lime Stone Overburden
Production SqM. Cu.M
1 2005-2006 Nil 20,000
2 2006-2007 52,786 30,000
3 2007-2008 1,57,550 85,750
4 2008-2009 2,68,650 1,14,300
5 2009-2010 7,84,921 1,60,000

5. PROPERTIES OF SOIL AND ROCKS
S.No. Parameter Value
1 Colour Green/Black
2 Texture Sandy Loam
3 pH 8.4
4 Bulk Density in gm/ce 1.4
5 Porosity (%) 45
6 Water Holding Capacity 49
B. Weather Parameters
Temperature - Maximum 47˚c Minimum 7˚c
Rain Fall - 50 cm to 80 cm per annum
Humidity - 30 to 70 percentage
C. Hard Rock
The Properties of hard rocks are as under:
S.No. Parameter Value
1 Bulck Density ( MT/ M 3) 1.7
2 Specific Gravity 2.46
3 Compressive 2160
Strength(Kg/Cum2)
4 Tensile Strength (Kg/cm2) 274
5 Shear Strength(Kg/cm2) 25.6
ACCIDENT STATISTICS:
Year Accident Cause
Reportable Fatal
2005-06 Nil Nil …
2006-07 Nil Nil …
2007-08 Nil Nil …
2008-09 Nil Nil …
2009-10 Nil Nil …

6. SLOPE FAILURE HISTORY:
No case of slope/bank failure has been noticed in enter
"Kota Stone" mining area right from inception. It has also been
observed that at many places vertical benches 35-40mtrs height have
existed for a long period without any movement.
Based upon observations and findings the anthor is of the
firm opinion that the almost vertical benches as practiced in Kota Stone
mining are quite stable and there are no chances of their failure.
However, some precautions becomes necessary to avoid any unforeseen
and underable incidences-
- Retaining walls should be constructed and maintained at the
foot of the working benches.
- To minimize ground vibrations. milli second multiple row blasting
( Axle or Redit) should be practised.
- Before the start of the work, a close and cautions inspection
should be made by the competent officials and dressing should
be carried out at frequent intervals to avoid full of loose stones
etc.
- All loose and hanging cliffs should be removed before the work
commencement.
- Further the angle of repose for dry waste dumps is about 38
degrees and moisture presence may lower if further. External and
internal waste dumps should be planned, designed and
maintained within the repose angle formations. Soils - sub soil
mixing in the waste dumps may bring down the repose angle
drastically and cause dump failure along clay storage planes
during rains. This critical situation need almost attention and
care.
- The Bench top and waste dumps should be properly drained off
so that no hydrostatic presser is built and exerted on the week
planes resifting into failures during rainy season.